It really boggles my mind how people react to this. What is the big deal that they hired "super models" for some mocap, you jelly or something?
It also makes sense, sorceresses are not ordinary women, they are described as extremely beautiful and they take pride in their looks and manners. Not saying that "super models" are the best role model, but it can be a good match for their purposes.
From my point of view it is normal to get some models to get this done properly for a few characters, after all we don't know how many of them will be present in the game.
I for one like this attention to the details. Even if there is some ulterior motive to it.